query

$meta_query = array(
	array(
		'key'     => 'vm_ft_project',
		'value'   => 'true',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'vm_ft_project_img',
		'compare' => 'EXISTS',
	),
);